package com.itheima.reggie.controller;

import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.UUID;

@Slf4j
@RestController
@RequestMapping("/common")
public class CommonController {
    @Value("${reggie.path}")
    private String basePath;
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) {
        //file是一个临时文件，要转存到指定位置，否则会自动删除
        log.info(file.toString());
        String originalFilename = file.getOriginalFilename();
        String substring = originalFilename.substring(originalFilename.lastIndexOf("."));
        String s = UUID.randomUUID().toString() + substring;

        File dir = new File(basePath);
        //判断当前目录是否存在
        if (!dir.exists()){
        dir.mkdir();
        }
        try {
            //将临时文件存储到指定位置
            file.transferTo(new File(basePath + s));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(s);
    }

    /**
     * 文件下载
     * @param name
     * @param response
     */
    @GetMapping("/download")
    public void downLoad(String name, HttpServletResponse response){

            //输入流，通过输入流读取文件内容
        try {
            FileInputStream fis=new FileInputStream(new File(basePath + name));

            //通过输出流将文件写回浏览器，在浏览器展示图片
            ServletOutputStream outputStream = response.getOutputStream();

            response.setContentType("img/jpeg");
            int len = 0;
            byte [] bytes=new byte[1024];
          while ((len= fis.read(bytes)) != -1){
                    outputStream.write(bytes,0,len);
                    outputStream.flush();
            }

          outputStream.close();
          fis.close();

        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
